Differences between a pdf document and a word document?

Most of you are familiar with Word processors and the files they use. How are these files different from Adobe Acrobat (.pdf) files?
Word processors give you complete editorial freedom. You can change the text in any way you like, and, with some significant limitations, also change its appearance in any way you like. You can't, in general, do this with Adobe Acrobat (at least not with the free Reader). However, the Adobe Acrobat format does a much better job of preserving the original appearance of the document, and will do so over nearly any platform. The Word processing files found on this site were all created in WordPerfect, so you will (hopefully) be able to match the document I created - if you have WordPerfect for Windows; if you have the same font I used to create the documents, and if (less important) you have the same printer. Otherwise, you may have to spend some or a lot of time reformatting the document (for example, if you have MS Word instead of WordPerfect). And if you don't have one of the major Word processors (meaning WordPerfect, MS Word, or Lotus WordPro), you may not be able to reformat it satisfactorily at all. None of this is a problem with PDF files: the file will look exactly as it was created, on nearly any computer. So, in short, pdf files preserve perfectly the "look and feel" of the document on any platform, but they generally don't allow the document to be modified.

learn more to read:http://justus.anglican.org/resources/bcp/Acrobat.htm